Concrete reinforcement

ABSTRACT

A concrete reinforcement comprises a structural steel mat, a lattice girder with a single upper boom rod, a single lower boom rod and diagonal braces with bent ends supporting the longitudinal rods of the steel mat, and the lower boom rod carried by the transverse rods of the steel mat. A brace extends transversely to the plane defined by the girder booms to one of the longitudinal steel mat rods and props up one of the boom rods of the girder.

United States Patent 1191 Wagner June 24, 1975 [54] CONCRETE REINFORCEMENT 3,778,951 12/1973 Oroschakoff 52/652 [76] Inventor: Edmund Wagner, Rheinblickstr. 6, FOREIGNPATENTS OR APPLICATIONS 3- wlesbaden'Blerbnchl 205,023 10/1923 United Kingdom 52/650 ermany [22] Filed: July 16, 1973 Primary ExaminerFrank L. Abbott Assistant ExaminerJames L. Ridgill, Jr. [211 Appl' 379411 Attorney, Agent, or Firm-Kurt Kelman [30] Foreign Application Priority Data [57] ABSTRACT July 15, 1972 Germany 2234941 A Concrete reinforcement Comprises a Structural Steel mat, a lattice girder with a single upper boom rod, a g g'g g i gjgg single lower boom rod and diagonal braces with bent 58] g 52/65O 652 ends supporting the longitudinal rods of the steel mat, 4 645 and the lower boom rod carried by the transverse rods of the steel mat. A brace extends transversely to the plane defined by the girder booms to one of the longil56] ;;::S :2 tudinal steel mat rods and props up one of the boom I rods of the girder. 2,151,861 3/1939 McLellan 52/650 3,744,207 7 1973 Oroschakofi I 3 Clams, 4 Drawmg Figures 1 CONCRETE REINFORCEMENT The present invention relates to improvements in a reinforcement for a completely or partially prefabricated reinforced-concrete slab.

Reinforcements 'of'this type-comprise a structural steel mat of a plurality of longitudinally extending steel rods and a plurality of transversely-extending steel rods substantially perpendicular't'o the longitudinal rods, and a lattice-'girder with braces extending diagonally between upper and lower, booms, the braces having bent ends partially encircling and thereby supporting the longitudinal rods of the structural steel mat, and the lower boom being carried by the transverse. rods of the structural steel mat. 1

In conventional reinforcements of this type, only one mat could be connected with the girder while a second mat had to be-attached by means of wires or like means, causing an excess of manual labor. This has been avoided according toone proposal by direct connections between the lattice girder and both mats. These connections consist of intersecting diagonal braces. In some reinforced concrete wall structures this is not a satisfactory solution. Furthermore, it makes the manufacture of such reinforcements relatively complicated. u

It is the primary object of this invention to provide a :reinforcement .of the general type described hereinabove which may berelatively easily manufactured automatically and whereinthe girders are simply connected with two mats.

All parts of the reinforcement may-be stacked and transported with little space requirement, and the reinforcement is strong enough to resist the pressures in the concrete forms during manufacture of-the reinforced slab..

The above andother objects .andadvantages are accomplished in accordance with the invention with a lattice girder comprising only a single upper boom rod and a single lower boom rod. A brace extends transversely to the plane defined by the booms to one of the longitudinal rods of the structural steel mat and props up one of the boom rods.

Preferably, two such structural steel mats are provided, the lattice girder extending therebetween, with the upper boom rod being in contact with the trans verse rods of the steel mat spaced from the mat carrying the lower boom rod.

Throughout the specification and claims, the term single boom rod includes an embodiment wherein two or more such rods are bundled or welded together to form the boom.

In a preferred embodiment, the propping brace has the form of a support clamp whose one end engages the upper boom rod and a longitudinal rod of one of the structural steel mats associated with the upper boom rod, and whose other end engages a longitudinal rod of the ohter structural steel mat.

According to one feature of the present invention, the clamp end engaging the upper boom rod is welded thereto to constitute a part of the lattice girder braces. This, in fact, may be viewed as a lattice girder with diagonal braces wherein only one of the legs of the braces are attached to a lower boom, the braces themselves consisting of the diagonal brace part and the support clamp part.

The above and other objects, advantages and features of this invention will become more apparent from the following detailed description of now preferred embodiments thereof, taken in conjunction with the accompanying drawing wherein FIG. 1 is a side elevational view of the lattice girder of a reinforcement according to one embodiment of the Referring now to the drawing illustrating reinforcements for reinforced concrete walls, the reinforcement is shown to comprise a planar or two-dimensional lat tice girder consisting of an upper boom rod 1, a lower boom rod 2 and a plurality of braces 3 diagonally extending between the upper and lower boom rods. The braces are spot welded or otherwise suitably affixed to the boom rods so as to form a lattice girder. The diameter of the upper b oom may desirably somewhat exceed that of the lower boom, or they may be of the same dimensions, depending on the structural requirements.

As will be seen from FIG. 2, the upper ends 5 of diagonal braces 3 are bent to enclose an obtuse angle with I the brace while the lower ends 6 are hook-shaped. The

upper and lower booms 1 and 2 are affixed to the side of the braces 3 opposite the direction in which their ends are bent. I

The reinforcement shown in FIG. 2 comprises two structural steel mats 8a and 8b each comprising a plurality ofglongitudinally extending steel rods 7 and a plurality of transversely extending steel rods 9 substantially perpendicular to the longitudinal rods. As illustrated, the hook-shaped ends 6 of braces 3 partially encircle and thereby support the longitudinal rods 7 of the lower mat 8b while the upper ends 5 of the braces engage the longitudinal rods 7 of upper mat 8a.

It is advantageous, as illustrated in FIG. 2, to arrange the girder parts in mirror-image fashion.

The lower boom rod 2 is carried by the'transverse rods 9 of the lower mat 8b so that the girder is propped up against movement in the direction of arrow 10. Braces 11 extend transversely of the plane defined by the booms to prop up the girder in the opposite direction, thus holding it firmly in erect position. In the embodiment of FIG. 2, the brace 11 has an upper hookshaped end 12 partially encirdling and gripping the upper boom rod 1 and a longitudinal rod 7 of upper mat 8a associated with the upper boom rod. The brace 11 extends obliquely between the two mats, its lower hook-shaped end 13 partially encircling and thereby supporting a longitudinal rod 7a of the lower mat spaced from the girder.

The embodiment of FIG. 3 differs from that of FIG. 2 only in that the longitudinal rods 7 of the structural steel mats 8a and 8b are outwardly mounted so that the boom rods of the lattice girder and the longitudinal rods of the mats are on opposite sides of the transverse rods 9 of the mats.

It will be appreciated from the above description of representativeembodiments of the present invention that, in a single step, the girder may be mounted on a structural mat simply by holding the girder obliquely so that the hookshaped ends 7 of braces 3 point downwardly while gliding the girder along the transverse rods 9 of the mat until it engages a longitudinalrod 7,

whereupon the girder is turned into upright position so that the brace ends 7 hook into the longitudinal rod and the girder is supported on the transverse rods. Further movement of the girder beyond its upright position in the direction of arrow is not possible because the lower boom rod 2 rests on the transverse rods 9 of the lower mat, thus preventing such movement.

The girder is now propped up in the upright position by applying braces 11 which have the form of a clamp, the hook-shaped ends of the clamp being engaged respectively with the upper boom rod 1 and with a longitudinal rod of the lower mat which is spaced from the girder. Through the clamping action, the braces 11 assume the function of tension rods. A twin girder is mounted in the same fashion (see FIG. 2) on the lower mat, each pair of girders being associated in mirrorimage fashion.

After the girders have been mounted on lower mat 8b, the upper structural steel mat 8a is mounted on the girders. Again in a single step, the longitudinal rods 7 of the upper mat are engaged with the bent ends of the braces 3 of the girders, whereupon the braces 11 are clamped into engagement.

The reinforcement of the present invention may be used for reinforced concrete walls or slabs of large areas, its use for reinforcing a large concrete slab being illustrated in FIG. 4. In this embodiment, the reinforcement comprises only a single structural steel mat 8b embedded with lower boom rod 2 is concrete slab 14. Pairs of diagonal braces of the girder are combined into substantially V-shaped hoops 3a.

When used for walls, the reinforcement has two steel mats, as shown in FIGS. 2 and 3, the entire reinforcement being embedded in concrete to form a reinforced wall.

What is claimed is:

l. A reinforcement for an at least partially prefabricated reinforced concrete slab, comprising in combination:

1. two structural steel mats each comprising a plurality of longitudinally extending steel rods and a plurality of transversely extending steel rods substantially perpendicular to the longitudinal rods; 2. a plurality of planar lattice girders extending between the two mats and comprising only a single 5 upper boom rod, a single lower boom rod and affixed thereto a plurality of braces extending diagonally between the upper and lower boom rods, the girder extending in the direction of the longitudinally extending steel rods of the mats;

a. the said braces having bent terminating ends facing opposite the side to which the upper and lower boom rods are affixed, one terminating end partially encircling and thereby supporting a longitudinal rod of the structural steel mats, the opposite terminating end being hook-shaped,

b. the lower boom rod being carried by the transverse rods of one of the structural steel mats, and

c. the upper boom rod being in contact with the transverse rods of the steel mat spaced from the mat carrying the lower boom rod, and

d. said plurality of planar lattice girders being spaced apart along the said structural steel mats;

and

3. a plurality of tension rods each extending transversely to the plane defined by the booms affixed to one of the longitudinal rods of the one structural steel mat, the tension rod partially encircling and thereby supporting one of the boom rods, and

4. a pair of girders and tension rods being associated in mirror-image fashion.

2. The reinforcement of claim 1, wherein the tension rod has the form of a support clamp, one of the ends of the clamp engaging the upper boom rod and a longitudinal rod of one of the structural steel mats associated with the upper boom rod, and the other clamp end engaging a longitudinal rod of the other structural steel mat.

3. The reinforcement of claim 2, wherein the clamp end engaging the upper boom rod is welded thereto. 

1. A reinforcement for an at least partially prefabricated reinforced concrete slab, comprising in combination:
 1. two structural steel mats each comprising a plurality of longitudinally extending steel rods and a plurality of transversely extending steel rods substantially perpendicular to the longitudinal rods;
 2. a plurality of planar lattice girders extending between the two mats and comprising only a single upper boom rod, a single lower boom rod and affixed thereto a plurality of braces extending diagonally between the upper and lower boom rods, the girder extending in the direction of the longitudinally extending steel rods of the mats; a. the said braces having bent terminating ends facing opposite the side to which the upper and lower boom rods are affixed, one terminating end partially encircling and thereby supporting a longitudinal rod of the structural steel mats, the opposite terminating end being hook-shaped, b. the lower boom rod being carried by the transverse rods of one of the structural steel mats, and c. the upper boom rod being in contact with the transverse rods of the steel mat spaced from the mat carrying the lower boom rod, and d. said plurality of planar lattice girders being spaced apart along the said structural steel mats; and
 3. a plurality of tension rods each extending transversely to the plane defined by the booms affixed to one of the longitudinal rods of the one structural steel mat, the tension rod partially encircling and thereby supporting one of the boom rods, and
 4. a pair of girders and tension rods being associated in mirror-image fashion.
 2. a plurality of planar lattice girders extending between the two mats and comprising only a single upper boom rod, a single lower boom rod and affixed thereto a plurality of braces extending diagonally between the upper and lower boom rods, the girder extending in the direction of the longitudinally extending steel rods of the mats; a. the said braces having bent terminating ends facing opposite the side to which the upper and lower boom rods are affixed, one terminating end partially encircling and thereby supporting a longitudinal rod of the structural steel mats, the opposite terminating end being hook-shaped, b. the lower boom rod being carried by the transverse rods of one of the structural steel mats, and c. the upper boom rod being in contact with the transverse rods of the steel mat spaced from the mat carrying the lower boom rod, and d. said plurality of planar lattice girders being spaced apart along the said structural steel mats; and
 2. The reinforcement of claim 1, wherein the tension rod has the form of a support clamp, one of the ends of the clamp engaging the upper boom rod and a longitudinal rod of one of the structural steel mats associated with the upper boom rod, and the other clamp end engaging a longitudinal rod of the other structural steel mat.
 3. The reinforcement of claim 2, wherein the clamp end engaging the upper boom rod is welded thereto.
 3. a plurality of tension rods each extending transversely to the plane defined by the booms affixed to one of the longitudinal rods of the one structural steel mat, the tension rod partially encircling and thereby supporting one of the boom rods, and
 4. a pair of girders and tension rods being associated in mirror-image fashion. 